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Rook and a bishop versus two knights: this is usually a win for the rook and bishop but it takes up to 223 moves. [61] The result of this endgame was unknown until computer analysis proved the forced win. Rook and a knight versus two knights: this is usually a draw, but there are some wins for the rook and knight that take up to 243 moves. [83]
Bishops, rooks, and queens gain up to 10 percent more value in open positions and lose up to 20 percent in closed positions. Knights gain up to 50 percent in closed positions and lose up to 30 percent in the corners and edges of the board. The value of a good bishop may be at least 10 percent higher than that of a bad bishop. [50]
It is assumed that White has the bishop and knight. Since checkmate can only be forced in the corner of the same color as the squares on which the bishop moves (the "right" corner), an opponent who is aware of this will first try to stay in the center of the board, and then move into in the "wrong" corner.
A bishop can easily influence both wings simultaneously, whereas a knight is less capable of doing so. In an open endgame, a pair of bishops is decidedly superior to either a bishop and a knight, or two knights. A player possessing a pair of bishops has a strategic weapon in the form of a long-term threat to trade down to an advantageous ...
In a two knights endgame, the side with the king and two knights cannot checkmate a bare king by force. This endgame should be a draw if the bare king plays correctly. A mate only occurs if the player with the bare king blunders. In some circumstances, if the side with the bare king instead has a pawn, it is possible to set up this type of ...
Checkmate can be forced with a bishop and knight, however, or with two bishops, even though the bishop and knight are in general about equal in value. Paradoxically, checkmate with two knights sometimes can be forced if the weaker side has a single extra pawn, but this is a curiosity of little practical value (see two knights endgame).
Unusually for an open formation, bishops become inferior to knights because of the overarching importance of d5: White will often exchange Bg5xf6, and Black usually prefers to give up their queen's bishop rather than a knight in exchange for a white knight if it gets to d5.
The Bishop's Opening is a chess opening that begins with the moves: . 1. e4 e5 2. Bc4. White attacks Black's f7-square and prevents Black from advancing the d-pawn to d5. By ignoring the beginner's maxim "develop knights before bishops", White leaves their f-pawn unblocked, preserving the possibility of f2–f4.